Set value to another form

Question

I have to form Form1 and Form2

Form1 source

namespace WindowsFormsApplication1
{
    public partial class Form1 :          


        

Answer 1

You need to pass a reference to your Form1 instance to the Form2 instance.

You can do that like this:

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void label1_Click(object sender, EventArgs e)
        {
            Form2 frm = new Form2(this); // <---- Pass a reference to this form to Form2
            frm.SetBtn = "teste test";
            frm.Show();
        }

        public string setLb
        {
            set
            {
                label1.Text = value;
            }
        }
    }
}

And you would need to change the Form2 implementation a little aswell:

namespace WindowsFormsApplication1
{
    public partial class Form2 : Form
    {
        private Form1 other;

        //Empty constructor for the designer
        public Form2()
        {
            InitializeComponent();
        }

        public Form2(Form1 other)
        {
            this.other = other;
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            other.setLb = "test test";
        }

        public string SetBtn
        {
            set
            {
                button1.Text = value;
            }
        }
    }
}